#!/bin/sh
# Build the riscv64 image the pipeline's jobs run in on narvi-1, and write it
# as a root file system tarball for `flow rootfs import`. There is no Docker
# on a RISC-V board, so this is Ubuntu Base 24.04.5 riscv64, checked against
# its published SHA-256, with the build's packages installed by apt in a
# chroot. Run it on a riscv64 Linux machine (narvi) as root or a user with
# sudo, then
#
#     FLOW_HOME=~/flow ~/flow/bin/flow rootfs import x16emu-riscv64.tar
#
# and pin the printed hash in .flow/pipeline.kdl. Rebuild, re-import and
# re-pin when the packages below change.
set -eu
here=$(cd "$(dirname "$0")" && pwd)
out=${1:-$here/x16emu-riscv64.tar}
release=24.04.5
base=ubuntu-base-$release-base-riscv64.tar.gz
sha256=651c516f291259ec913caa1efd0cfff738cd223adfc6617c884f07af487f08cf
# What the Makefile and the conformance suite need, as README.md lists for
# riscv64 Linux: C11 and C++17 compilers, make, SDL2 and zlib, Python and
# pytest.
packages="build-essential make libsdl2-dev zlib1g-dev python3 python3-pytest"

test "$(uname -m)" = riscv64 || { echo "build-riscv64.sh: run this on a riscv64 machine" >&2; exit 1; }
work=$(mktemp -d)
root=$work/root
cleanup() {
	sudo umount "$root/proc" "$root/dev" 2>/dev/null || true
	sudo rm -rf "$work"
}
trap cleanup EXIT

curl -fsSL -o "$work/$base" "https://cdimage.ubuntu.com/ubuntu-base/releases/$release/release/$base"
echo "$sha256  $work/$base" | sha256sum -c - >/dev/null
mkdir "$root"
sudo tar -C "$root" -xzf "$work/$base"
sudo mv "$root/etc/resolv.conf" "$work/resolv.conf.image" 2>/dev/null || true
sudo cp /etc/resolv.conf "$root/etc/resolv.conf"
sudo mount --bind /dev "$root/dev"
sudo mount -t proc proc "$root/proc"
sudo chroot "$root" sh -c "
	export DEBIAN_FRONTEND=noninteractive
	apt-get update -q >/dev/null
	apt-get install -y -q --no-install-recommends $packages >/dev/null
	apt-get clean
	rm -rf /var/lib/apt/lists/*"
sudo umount "$root/proc" "$root/dev"
sudo rm "$root/etc/resolv.conf"
sudo mv "$work/resolv.conf.image" "$root/etc/resolv.conf" 2>/dev/null || true
sudo tar -C "$root" -cf "$out" .
sudo chown "$(id -u):$(id -g)" "$out"
echo "$out"